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裂纹是线性摩擦焊整体叶盘结构制造过程中叶片焊缝区域常见的缺陷类型之一。由于叶片焊缝区域结构复杂且裂纹缺陷尺寸小,因此焊缝区域裂纹缺陷的检测难度大。为了满足新工艺的应用要求,研究了焊缝区域的相控阵超声全覆盖检测方法,建立了焊缝区域相控阵超声检测的有限元仿真模型,研究了裂纹特征参数和声束聚焦点位置对检测方案的影响,验证了检测方案的可行性与正确性。构建了机器人化的相控阵超声检测系统,模拟了声束在线性摩擦焊叶片试样中的传播过程,实现了对叶片中预制裂纹缺陷的识别。研究结果表明,设计的检测方案能够满足叶片快速检测的要求。
Crack is one of the common types of defects in the weld area of the blade in the process of linear friction welding overall leaf disc structure. Due to the complex structure of the blade weld and the small size of the crack defects, it is very difficult to detect the crack defects in the weld area. In order to meet the application requirements of the new technology, the full coverage of the phased array ultrasonic inspection of the weld area was studied, and the finite element simulation model of the phased array ultrasonic inspection of the weld area was established. The crack characteristic parameters and the focus position of the beam The impact of the test program to verify the feasibility of the test program and correctness. A robotic phased array ultrasonic testing system was constructed to simulate the propagation of acoustic beam in the linear friction welding blade sample and realize the identification of prefabricated crack defects in the blade. The results show that the design of the test program to meet the requirements of rapid leaf testing.